Ingredients
mustard seeds - 1 tsp
urad dal - 1 tsp
green chillies - 4
onions - 2 big
besan gram flour - 3 tsp
curry leaves - 10
tomatoes - 2
oil - 1 tsp
salt - as desired

Method
Chop onions , tomatoes, green chillies finely.
Heat oil in a pan, add mustard seeds, urad dal & let it splutter, then add onion, green chillies, curry leaves and tomatoes to it & fry it.
Mix the besan gram flour with water add salt to it and add this mixture to the pan, allow it to boil till it becomes like a paste .
Garnish with coriander leaves.
Total cooking time would be 15-20 minutes, you can also add boiled potatoes to it.